GRAS KB5000 Right Anthropometric Pinna 35 Shore OO

  • Anatomically shaped concha and ear canal
  • Improved fit and repeatability
  • Outer pinna with improved collapsibility
  • Resilient mounting

The KB5000 is a right-side anthropometric pinna designed for use with the 45BB/45BC KEMAR or 43AG, enabling accurate and repeatable testing of headphones and earphones.  It has anatomically correct ear-entrance and ear-canal with correct soft ear helix and provides perfect sealing and insertion accuracy for headphones and earphones. The hardness is 35 Shore OO

The pinna is supplied with the following accessories:

  • 2x SK6012 finger screws for mounting on the 45BB/45BC KEMAR or 43AG
  • 1x RA0517 kit including the GR1874 holder ring
  • 1x YY028 3 mm Allen key

Technology

The KB5000 is a right-side pinna featuring an anthropometric concha and ear canal, designed for use with the GRAS 45BB and 45BC KEMAR, or the 43AG test fixture. It is crafted from soft silicone with a hardness of 35 Shore OO.

Below it is possible to see examples of the anthropometric pinna in use:

GRAS Anthropometric pinna mounted on a 45BB/45BC KEMAR using the RA0517 kit and finger screws (both included with the anthropometric pinna):

GRAS anthropometric pinna mounted on the 43AG test fixture's cheek plate using the RA0517 kit and finger screws (both included with the anthropometric pinna):

 

 

GRAS anthropometric pinna mounted on a 711-style (IEC 60318-4) ear simulator using the RA0517 kit with GR1874 holder ring:

The external shape of the pinna is identical to that of the standardized KEMAR pinna, but concha and canal have been modified so that they closely mimic the properties of a real human ear. The ear canal has been extended and is an integral part of the pinna that now seals directly against the ear simulator. Like the human ear, the ear canal now has the 1st and 2nd bend, and the interface with the concha is oval.

This shape makes it possible to achieve good insertion accuracy and sealing with anatomically shaped in-ear transducers such as ear-bud headphones, in-ear hearing protectors, and insert hearing aids. Controlling the insertion depth is easy, leading to better insertion consistency and improved repeatability of measurements. The better fit and seal also means that the low frequency response is improved. It will allow you to reproduce base response, as well as effectively measure (active & passive) attenuation.

The outer pinna has the same shape as the standardized pinna, but the flexibility has been improved to better mimic the way the human ear collapses when supra-aural and circum-aural earphones are mounted. When measuring the frequency response of these types of headphones, more reliable and repeatable measurements can be achieved because of the improved collapsibility of the pinna. 

The pinna is screwed onto the ear simulator which in turn is fixed with screws that ensure that the pinna is held firmly in place. Therefore, the mounting is very stable, and it is possible to mount and dismount DUTs repeatedly without compromising the seal.